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!, 22 May 2000 <br /> AGE-NC Project No. 98-0432 <br /> ' Page 2 of 3 <br /> ' samples were labeled and placed in a chilled container for transportation under chain-of-custody to <br /> McCampbell Analytical Laboratory(MAI) in Pacheco, California, a State of California Department <br /> of Health Services (DHS) Laboratory. Each sample was analyzed for: <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in . <br /> accordance with EPA Method 8015 Modified, <br /> ' Volatile aromatic compounds: benzene, toluene, ethyl-benzene and total xylenes (BTEX) <br /> with methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8020 and <br /> ' Fuel oxygenating compounds including di-isopropyl ether(DIPE), ethyl tertiary-butyl ether <br /> (ETBE), ethanol, MTBE, tertiary-amyl methyl ether(TAME)and tertiary-butanol (TBA) in <br /> accordance with EPA Method 8260 Modified. <br /> 3.0. FINDINGS <br /> 3.1. GROUND WATER ELEVATION, FLOW DIRECTION AND GRADIENT <br /> Depth to ground water at the site ranged from 13.35 to 14.25 feet below well casing top. The ground <br /> water elevation in eachwell was calculated from these data. The ground water elevations at the site <br /> ranged from 23.65 feet to 23.79 feet above mean sea level (Table 1). The ground water flow <br /> direction and gradient were calculated from the well elevation data. <br /> ' Contours of the ground water elevation data indicate that the ground water flow was directed toward <br /> the northwest. Figure 3 illustrates the contoured ground water elevations. <br /> 3.2. , HYDROCARBON-IMPACTED GROUND WATER <br /> ' TPH-g was only detected in ground water sample MW-I at 290 micrograms per liter(,ug/1). TPH-d <br /> were detected in the samples MW-1 and MW-2 at 170 gg/1 and 200 ,ugll, respectively. BTEX <br /> ' compounds were not detected in any of the ground water samples analyzed from the site. <br /> MTBE was detected in samples MW-1, MW-2 and MW-3 utilizing EPA method 8020 at <br /> ' concentrations of 26,000 ug/l, 1,100 Ag/1 and 170 kigll, respectively. These concentrations were - <br /> requantified by EPA method 8260m at 3 1,000µg/1, 1,200,ug/l and 150,ug/l, respectively. TBA was <br /> also detected in MW-1 of 1,500 pg/l. No other fuel oxygenates were detected in the three samples. <br /> Analytical results from ground water samples are summarized in Tables 2 and 3. The laboratory' reports(MAI Laboratory ID 36901 to 36904),quality assurance and quality control(QA/QC)reports <br /> ' and chain-of-custody forms are included in Appendix B. <br /> Advanced GeoEnvironmental,Inc. <br /> 1 i <br />